Dyeing device, method and application of polyester fabric

Abstract

The invention relates to a dyeing device, method and use of polyester fabrics. The dyeing device includes a dye vat heat exchanger, a dye vat and a plate heat exchanger connected in sequence; the plate heat exchanger is controlled by a plate heat exchanger PLC controller; The dye vat and the dye vat heat exchanger are controlled by the dye vat PLC controller. The pressure transmitter inside the dye vat is connected to the plate heat exchanger PLC controller; the two PLC controllers are connected through a signal transmitter; the dye liquor circulation pipeline on the dye vat Along the direction of dye liquor flow, there are hot water discharge branch, hot water inlet branch and dye vat main circulation pump. There are valves and flow meters on both branches. The hot water inlet branch is also equipped with pre-drainage valve and inlet valve. Cold water variable frequency pump; the two branches are connected to the plate heat exchanger; each valve, flow meter and pump are controlled by the PLC controller of the plate heat exchanger. For high-temperature dyeing and liquid drainage cleaning, the oligomer removal rate is more than 90% higher than that of traditional processes.

Description

technical field [0001] The invention relates to the technical field of textiles, in particular to a polyester fabric dyeing device, method and application thereof. Background technique [0002] Polyester fiber is the most consumed synthetic fiber in the world today. The basic component of polyester is polyethylene terephthalate, with the molecular formula [-OC-Ph-COOCH 2 CH 2 O-]n, so it is also called polyester fiber (PET), the chemical structure formula of its long chain molecule is H(OCH 2 CCOCO) NOCH 2 CH 2 OH, the relative molecular weight is generally around 18000-25000. It is a fiber-forming high polymer prepared from purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) through esterification or transesterification and polycondensation reactions— - Polyethylene terephthalate (PET). [0003] The polymerization synthesis of polyester is divided into three stages, the initial stage: the conversion of monomers into oligomers; the...

AI Technical Summary

Problems solved by technology

[0010] 3. Oligomers migrate from the inside of the fiber to the surface, affecting the feel and appearance;

[0011] 4. The oligomers cause the friction of the yarn to increase, causing the quality of the yarn to decline;

[0012] 5. Oligomers and disperse dyes coagulate to form stains that are difficult to remove

[0016] However, the process method disclosed by CN10483155A still has deficiencies: during cooling from 130° C. to 95° C., the pressure in the vat decreases continuously with the decrease of the temperature of the dyeing vat, and the flow rate and amount of raffinate water begin to slow down. The flow rate of injecting clean water into the dye vat under the pressure of 3 to 5 bar and supplying cold water for heat exchange, if there is too much injection of hot clean water and cannot reach the control, when the temperature of clean water is 10-15°C lower than the temperature of the residual liquid, it will be injected into the dye vat, resulting in the internal temperature of the dye vat Unstable, the water level of the overall dyeing vat rises, and the fabric running is not smooth; the second valve and the third valve are replaced to control the flow rate of clean water, the response is slow and the control valve is single-selected, and the valve cannot be flexibly changed to control the flow rate and volume of clean water, and the temperature in the overall dyeing vat drops. When it is slightly faster, it leads to poor quality of dyed and produced fabrics

In general, there are problems such as difficult and unstable production dyeing operations, too little or too much high-temperature washing water for entering hot water and hot water for draining residual liquid, too much energy loss, and large deviations in control accuracy. There are some problems such as heat energy and The waste of water resources, the cooling rate is not easy to control, the degree of automation needs to be improved, the scope of application of the process is narrow, and the process takes a long time

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